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Neutronové hvězdy zprávy
X-ray source in 4U 1822-371 found where the stream of matter from secondary star hits the neutron star's disk
7. 3. 2026
Hvězdy | Neutronové hvězdyScientists have used X-ray observations to create a detailed map of the Fe K emission in the low-mass X-ray binary system 4U 1822-371. This system consists of a compact object, likely a neutron star, and a companion star orbiting each other every 5.57 hours. The study used data from the XRISM satellite, covering eleven orbits of the system, to track how the X-ray emission changes with the orbital period.
By analyzing the Doppler shifts in the Fe K line, the researchers produced the first velo...
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28. 2. 2026Hvězdy | Neutronové hvězdy...
Read article 15. 2. 2026Hvězdy | NuSTAR | Veleobři | Neutronové hvězdy...
Read article Research in Neutronové hvězdy
Frequently Asked Questions about nearby stars
What is the nearest star?
Nearest star is Proxima Centauri, located approximately 4.24 light-years (1.30 parsecs) from the Sun. It is part of the Alpha Centauri star system, which also includes Alpha Centauri A and Alpha Centauri B.
What are the nearest stars to Earth?
Nearest stars to Earth include the Alpha Centauri system (Alpha Centauri A, Alpha Centauri B, and Proxima Centauri), Barnard's Star, and Wolf 359. There are also brown dwarfs Luhman 16 and WISE 0855−0714.
What is the solar neighborhood?
Solar neighborhood (also Local Interstellar Cloud) is the region of interstellar space that surrounds the Sun with diameter about 15 light years. Stellar Catalog database includes all stars contained within this region.
How do astronomers measure distances to stars?
Astronomers use methods like parallax, standard candles, and redshift to measure distances to stars. Parallax is especially useful for nearby stars in our solar neighborhood, while other techniques help map the universe beyond.
Are there any exoplanets orbiting the nearest stars?
Yes, several exoplanets have been discovered orbiting the nearest stars. For example, Proxima Centauri has an exoplanet called Proxima Centauri b, which is located in the star's habitable zone and is the closest known exoplanet to Earth.
Why are the nearest stars important for astronomy and physics?
The nearest stars provide valuable laboratories for studying stellar evolution, space environments, and the fundamental physics of stars. Observing these stars helps astronomers understand the structure of our galaxy and the broader universe.
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StellarGuide: Hvězdy
Hvězdy
Hvězdy jsou obrovské koule horkého plynu, které září díky energii vznikající jadernou fúzí v jejich jádru. Většina hvězd se skládá převážně z vodíku a helia. V centru hvězdy dochází díky vysokému tlaku a teplotě k přeměně vodíku na helium, přičemž se uvolňuje obrovské množství energie ve formě světla a tepla.More about Hvězdy